From 15dc91ff952da117ed95ca7bc9d5a097b67d3b9a Mon Sep 17 00:00:00 2001
From: r-vdp <ramses@well-founded.dev>
Date: Tue, 30 Dec 2025 13:47:16 +0200
Subject: [PATCH] nixos-rebuild-ng: pass the NIXOS_NO_CHECK variable through
 the systemd-run and sudo invocations

This allows to skip nixos pre-switch check when running switch-to-configuration.
---
 nixos/modules/system/activation/switchable-system.nix | 11 +++++++++++
 .../ni/nixos-rebuild-ng/src/nixos_rebuild/nix.py      |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/nixos/modules/system/activation/switchable-system.nix b/nixos/modules/system/activation/switchable-system.nix
index 380b52b6825d..8c7159c3ec7e 100644
--- a/nixos/modules/system/activation/switchable-system.nix
+++ b/nixos/modules/system/activation/switchable-system.nix
@@ -140,5 +140,16 @@
           fi
         '';
     };
+
+    security =
+      let
+        extraConfig = ''
+          Defaults env_keep+=NIXOS_NO_CHECK
+        '';
+      in
+      {
+        sudo = { inherit extraConfig; };
+        sudo-rs = { inherit extraConfig; };
+      };
   };
 }
diff --git a/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/nix.py b/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/nix.py
index cf3f1eefc891..f30ccf90d1ea 100644
--- a/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/nix.py
+++ b/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/nix.py
@@ -37,6 +37,8 @@ SWITCH_TO_CONFIGURATION_CMD_PREFIX: Final = [
     "LOCALE_ARCHIVE",
     "-E",
     "NIXOS_INSTALL_BOOTLOADER",
+    "-E",
+    "NIXOS_NO_CHECK",
     "--collect",
     "--no-ask-password",
     "--pipe",